import java.lang.reflect.*;
import java.util.*;
/**
 * Created by ScorpionOrange on 2016/08/21.
 */
public class ProxyTest {
    public static void main(String[] args){
        Object[] elements = new Object[1000];

        //fill elements with proxies for the integers 1 ... 1000
        for(int i = 0; i < elements.length; i++){
            Integer value = i + 1;
            InvocationHandler handler = new TraceHandler(value);
            Object proxy = Proxy.newProxyInstance(null, new Class[]{ Comparable.class}, handler);
            elements[i] = proxy;
        }

        //construct a random integer
        Integer key = new Random().nextInt(elements.length) + 1;

        //search for the key
        int result = Arrays.binarySearch(elements, key);

        //print match if found
        if(result >= 0){
            System.out.println(elements[result]);
        }
    }
}

/**
 * An invocation handler that prints out the method name and parameters, then invokes the original method
 */
class TraceHandler implements InvocationHandler{
    private Object target;

    /**
     * Constructs a TraceHandler
     * @param t the implicit parameter of the method call
     */
    public TraceHandler(Object t){
        target = t;
    }

    public Object invoke (Object proxy, Method m, Object[] args) throws Throwable{
        //print implicit argument
        System.out.println(target);
        //print method name
        System.out.print("." + m.getName() + "(");

        //print explicit arguments
        if(args != null){
            for(int i = 0; i < args.length; i++){
                System.out.print(args[i]);
                if(i < args.length - 1) {
                    System.out.print(", ");
                }
            }
        }
        System.out.println(")");

        //invoke actual method
        return m.invoke(target, args);
    }
}
